Cut top off the round pesto loaf. Make a bread bowl, leaving about 1/2 inch wall of bread. Toast bread top lightly; set aside to cool. Cut toasted bread into cubes. Dice hard-cooked eggs and tomatoes. Heat bacon in microwave until crisp according to package directions. Chop coarsely. In a large bowl, combine bread cubes, tomatoes, basil, eggs, cucumber, and bacon. Add salad dressing; toss lightly to mix. Just before serving, transfer salad to the hollowed pesto loaf. Garnish as desired with any of the following: hard-cooked eggs, tomatoes, cucumber slices, or basil leaves.